<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .add{
            display: inline-block;
            width: 76px;
            height: 76px;
            border: 2px dashed;
            transition: color .25s;
            position: relative;
            overflow: hidden;
        }
        .add::before,.add::after{
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
        }
        .add::before{
            width: 20px;
            border-top: 4px solid;
            margin: -2px 0 0 -10px;
        }
        .add::after{
            height: 20px;
            border-left: 4px solid;
            margin: -10px 0 0 -2px;
        }
        .add:hover{
            color: red;
        }
    </style>
</head>
<body>
    <a href class="add" title="继续上传"></a>
</body>
</html>